Angular Library CSS not working in main project after upgrading from v15 to v18

I have an angular library and angular project both were on v15 with material on 14, Now i have upgraded all to v18.

In the library, there are many components. Each having their own scss files. When running the library tester the CSS works fine.

But when i package the library and install it in the main project, All of the custom css has stopped working. Even the inline styles are not being applied.

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